Molecular sieve synthesis system and method based on circulating fluidized bed waste heat gradient utilization

Abstract

The invention discloses a molecular sieve synthesis system and method based on circulating fluidized bed waste heat gradient utilization, relates to the field of waste heat utilization devices, and can solve the problems that in the prior art, two modes are provided for flue gas treatment, one mode is direct treatment and emission during production, direct emission can cause resource waste, and the cost is low. And the other method is to recycle the flue gas, and the existing recycling method is simple and can only be used once. The method comprises the following steps: fixedly communicating an air inlet end of a breather pipe assembly positioned at the upper end with the tail part of a flue, and fixedly communicating an air inlet end of a breather pipe assembly positioned at the lower end with the head part of the flue; medium and low temperature flue gas enters an acid leaching stirrer through a gas inlet pipe at a gas outlet end for waste heat recycling; high-temperature flue gas enters the high-temperature calcinator through the gas outlet end and the gas inlet pipe II for waste heat recycling; flue gas pushes the wind plate and the rotating shaft to rotate, and dust and impurities adhering to the filter screen are brushed away.

Description

Technical Field

[0001] The present invention belongs to the field of waste heat utilization devices, especially a molecular sieve synthesis system and method based on cascaded utilization of waste heat in a circulating fluidized bed. Background Art

[0002] During the production process of existing circulating fluidized bed boilers, a large amount of waste heat is generated. Waste heat is redundant and discarded energy. This waste heat exists in the form of flue gas. There are two ways to treat the flue gas. One is to directly treat and discharge it during production. Direct discharge will cause waste of resources, and the flue gas contains a large amount of dust and impurities that will pollute the environment. The other is to recycle the flue gas. Existing recycling methods are simple and can only be used once. The temperatures of the flue gas at different heights are different when the flue gas is discharged. Existing waste heat recovery and utilization devices cannot achieve cascaded utilization of waste heat and cannot be recycled. Therefore, this case proposes a molecular sieve synthesis system and method based on cascaded utilization of waste heat in a circulating fluidized bed. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems existing in the prior art and provide a molecular sieve synthesis system and method based on cascaded utilization of waste heat in a circulating fluidized bed.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A molecular sieve synthesis system based on cascaded utilization of waste heat in a circulating fluidized bed includes: a housing, a circulation device, an acid leaching stirrer, and a high-temperature calciner. The circulation device is fixed at the upper end of the housing. The acid leaching stirrer and the high-temperature calciner are fixed inside the housing. The acid leaching stirrer is communicated with the high-temperature calciner. The circulation device is communicated with the acid leaching stirrer and the high-temperature calciner.

[0006] The circulation device includes: a fixed housing, a ventilation pipe assembly, and a temperature regulation unit. The fixed housing is fixed at the upper end of the housing. Two ventilation pipe assemblies are fixed inside the fixed housing. A temperature regulation unit is fixedly communicated between the two ventilation pipe assemblies.

[0007] Each of the two ventilation pipe assemblies includes: a filter barrel, an air inlet end, an air outlet end, a filter net, a rotating shaft, a one-way bearing, a wind plate, and a brush plate. The air inlet end is arranged on one side of the filter barrel. The air outlet end is arranged on the other side of the filter barrel. The filter net is arranged on one side of the air outlet end. The two ends of the rotating shaft are rotationally connected to the inner top surface and the inner bottom surface of the filter barrel through one-way bearings. A plurality of wind plates and a plurality of brush plates are fixed on the rotating shaft. The plurality of brush plates and the plurality of wind plates are arranged alternately. The plurality of wind plates and the plurality of brush plates are both slidably attached to the inner wall of the filter barrel. A dust cleaning port is arranged on the filter barrel.

[0008] The temperature control unit includes: a connecting pipe, a baffle, a baffle hole, a flap, a stepper motor, an air collecting hood and a temperature sensor. A connecting pipe is fixedly connected between the air outlet ends of the two ventilation pipe assemblies. A baffle is horizontally arranged inside the connecting pipe. A baffle hole is arranged on the baffle. The flap rotates in the baffle hole. The outer wall of the flap and the inner wall of the baffle hole are slidingly sealed. A stepper motor is fixed inside the baffle. The output shaft of the stepper motor is fixedly connected to the rotating shaft at one end of the flap. An air collecting hood is fixed to the upper end of the connecting pipe. The air collecting hood is fixedly connected to the air outlet end of the ventilation pipe assembly located at the upper end. A temperature sensor is arranged inside the air outlet end of the ventilation pipe assembly located at the upper end. The signal of the lower end of the temperature sensor is connected to a single-chip microcomputer, and the single-chip microcomputer is connected to the stepper motor signal.

[0009] The acid leaching agitator is provided with an air inlet pipe and an air outlet pipe. The air inlet pipe is fixedly connected to the air outlet end of the vent pipe assembly at the upper end, and the air outlet pipe is fixedly connected to the air inlet end of the vent pipe assembly at the upper end.

[0010] The high-temperature calciner is provided with an air inlet pipe 2 and an air outlet pipe 2. The air inlet pipe 2 is fixedly connected to the air outlet end of the vent pipe assembly at the lower end, and the air outlet pipe 2 is fixedly connected to the acid leaching agitator.

[0011] A method for using a molecular sieve synthesis system based on cascade utilization of waste heat from a circulating fluidized bed, the method comprising the following steps:

[0012] S1: The air inlet end of the vent pipe assembly at the upper end is fixedly connected to the tail end of the flue, and the air inlet end of the vent pipe assembly at the lower end is fixedly connected to the head end of the flue;

[0013] S2: The medium and low temperature flue gas enters the acid leaching agitator through the air inlet pipe at the air outlet end for waste heat reuse, and the flue gas repeatedly enters the air inlet end of the vent pipe assembly at the upper end through the air outlet pipe for circulation;

[0014] S3: The high-temperature flue gas enters the high-temperature calciner through the gas outlet and the second gas inlet pipe for waste heat reuse, and the flue gas enters the acid leaching agitator through the second gas outlet pipe for reuse;

[0015] S4: The temperature sensor detects that the flue gas temperature is too low, and sends a signal to rotate the output shaft of the stepper motor 90 degrees so that the high-temperature flue gas heats the low-temperature flue gas;

[0016] S5: The smoke pushes the wind plate and the rotating shaft to rotate, brushing off the dust and impurities adhering to the filter net.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a molecular sieve synthesis system based on the cascaded utilization of waste heat in a circulating fluidized bed, which can solve the problems proposed in the background technology: A large amount of waste heat is generated during the production process of existing circulating fluidized bed boilers. Waste heat is redundant and discarded energy. This waste heat exists in the form of flue gas. There are two ways to treat flue gas. One is to directly treat and discharge it during production, which will cause waste of resources, and the flue gas contains a large amount of dust and impurities that will pollute the environment. And the other is to recycle the flue gas. The existing recycling methods are simple and can only be used once. The temperature of the flue gas at different heights is different when the flue gas is discharged. The existing waste heat recovery and utilization devices cannot achieve the cascaded utilization of waste heat and cannot be recycled either.

[0019] The present invention can collect high-temperature flue gas and medium-low temperature flue gas simultaneously by setting a circulating device, thereby collecting waste heat more fully and realizing the cascaded utilization of waste heat. By setting an acid leaching stirrer and a high-temperature calciner, the collected waste heat can be cascaded and reused, and at the same time, secondary circulation can be carried out after the acid leaching stirrer and the high-temperature calciner have utilized the waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure.

[0021] Figure 2 is a schematic diagram of the structure of the ventilation pipe assembly;

[0022] Figure 3 is a top view of the ventilation pipe assembly;

[0023] Figure 4 is a schematic diagram of the structure of the temperature control unit;

[0024] Figure 5 is a top view of the connecting pipe;

[0025] Figure 6 is a flow chart of the molecular sieve synthesis system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0027] A molecular sieve synthesis system based on cascade utilization of waste heat in a circulating fluidized bed, comprising: a housing 1, a circulation device 2, an acid leaching stirrer 3 and a high-temperature calciner 4. The circulation device 2 is fixed to the upper end of the housing 1. The acid leaching stirrer 3 and the high-temperature calciner 4 are fixed inside the housing 1. The acid leaching stirrer 3 is communicated with the high-temperature calciner 4. The circulation device 2 is communicated with the acid leaching stirrer 3 and the high-temperature calciner 4.

[0028] The circulation device 2 comprises: a fixed housing 2-1, a ventilation pipe assembly 2-2 and a temperature control unit 2-3. The fixed housing 2-1 is fixed to the upper end of the housing 1. Two of the ventilation pipe assemblies 2-2 are fixed inside the fixed housing 2-1. A temperature control unit 2-3 is fixedly communicated between the two ventilation pipe assemblies 2-2.

[0029] Each of the two ventilation pipe assemblies 2-2 comprises: a filter barrel 2-2-1, an air inlet end 2-2-2, an air outlet end 2-2-3, a filter net 2-2-4, a rotating shaft 2-2-5, a one-way bearing 2-2-6, a wind plate 2-2-7 and a brush plate 2-2-8. An air inlet end 2-2-2 is arranged on one side of the filter barrel 2-2-1. An air outlet end 2-2-3 is arranged on the other side of the filter barrel 2-2-1. A filter net 2-2-4 is arranged on one side of the air outlet end 2-2-3. Both ends of the rotating shaft 2-2-5 are rotatably connected to the inner top surface and the inner bottom surface of the filter barrel 2-2-1 through the one-way bearing 2-2-6. A plurality of the wind plates 2-2-7 and a plurality of the brush plates 2-2-8 are fixed on the rotating shaft 2-2-5. The plurality of the brush plates 2-2-8 and the plurality of the wind plates 2-2-7 are arranged alternately. The plurality of the wind plates 2-2-7 and the plurality of the brush plates 2-2-8 are both slidably attached to the inner wall of the filter barrel 2-2-1. A dust cleaning port is arranged on the filter barrel 2-2-1.

[0030] The temperature control unit 2-3 includes: a connecting pipe 2-3-1, a baffle 2-3-2, a baffle hole 2-3-3, a flap 2-3-4, a stepping motor 2-3-5, an air collecting hood 2-3-6 and a temperature sensor 2-3-7. The connecting pipe 2-3-1 is fixedly connected between the air outlet ends 2-2-3 of the two ventilation pipe assemblies 2-2. A baffle 2-3-2 is horizontally arranged inside the connecting pipe 2-3-1. The baffle 2-3-2 is provided with a baffle hole 2-3-3. The flap 2-3-4 rotates in the baffle hole 2-3-3. The outer wall of the flap 2-3-4 is in contact with the inner wall of the baffle hole 2-3-3. Wall sliding seal, a stepper motor 2-3-5 is fixed inside the baffle 2-3-2, the output shaft of the stepper motor 2-3-5 is fixedly connected to the rotating shaft at one end of the flap 2-3-4, an air collecting hood 2-3-6 is fixedly connected to the upper end of the connecting pipe 2-3-1, the air collecting hood 2-3-6 is fixedly connected to the air outlet 2-2-3 provided in the ventilation pipe assembly 2-2 located at the upper end, a temperature sensor 2-3-7 is provided inside the air outlet 2-2-3 provided in the ventilation pipe assembly 2-2 located at the upper end, the lower end signal of the temperature sensor 2-3-7 is connected to a single-chip microcomputer, and the single-chip microcomputer is connected to the stepper motor 2-3-5 signal.

[0031] The acid leaching agitator 3 is provided with an air inlet pipe 3-1 and an air outlet pipe 3-2. The air inlet pipe 3-1 is fixedly connected to the air outlet end 2-2-3 of the vent pipe assembly 2-2 located at the upper end, and the air outlet pipe 3-2 is fixedly connected to the air inlet end 2-2-2 of the vent pipe assembly 2-2 located at the upper end.

[0032] The high temperature calciner 4 is provided with an air inlet pipe 4-1 and an air outlet pipe 4-2. The air inlet pipe 4-1 is fixedly connected to the air outlet end 2-2-3 of the vent pipe assembly 2-2 at the lower end, and the air outlet pipe 4-2 is fixedly connected to the acid leaching agitator 3.

[0033] The acid leaching stirrer 3 and the high-temperature calciner 4 are both purchased from outside according to the existing technology. The acid leaching stirrer 3 is an ultrasonic stirrer, and the high-temperature calciner 4 is a tubular furnace.

[0034] A method for using a molecular sieve synthesis system based on cascade utilization of waste heat from a circulating fluidized bed, the method comprising the following steps:

[0035] S1: The air inlet end 2-2-2 of the vent pipe assembly 2-2 at the upper end is fixedly connected to the tail end of the flue, and the air inlet end 2-2-2 of the vent pipe assembly 2-2 at the lower end is fixedly connected to the head end of the flue;

[0036] S2: The medium and low temperature flue gas enters the acid leaching agitator 3 through the air inlet pipe 3-1 at the air outlet end 2-2-3 for waste heat reuse, and the flue gas enters the air inlet end 2-2-2 set in the ventilation pipe assembly 2-2 at the upper end through the air outlet pipe 3-2 for circulation;

[0037] S3: The high-temperature flue gas enters the high-temperature calciner 4 through the air outlet 2-2-3 and the second inlet pipe 4-1 for waste heat reuse, and the flue gas enters the acid leaching agitator 3 through the second outlet pipe 4-2 for reuse again;

[0038] S4: When the temperature sensor 2-3-7 detects that the temperature of the flue gas is too low, it sends a signal to make the output shaft of the stepping motor 2-3-5 rotate 90° to heat the low-temperature flue gas with the high-temperature flue gas;

[0039] S5: The flue gas pushes the wind plate 2-2-7 and the rotating shaft 2-2-5 to rotate, and brushes off the dust and impurities adhering to the filter screen 2-2-4.

[0040] The working principle of the present invention is:

[0041] The flue gas temperature of the circulating fluidized bed boiler gradually decreases from the furnace to the tail flue. The temperature at the head of the flue entering the furnace can reach 800°C, and the temperature of the tail flue can reach 150°C.

[0042] During use, the air inlet 2-2-2 provided by the ventilation pipe assembly 2-2 located at the upper end is fixedly communicated with the tail of the flue, and the air inlet 2-2-2 provided by the ventilation pipe assembly 2-2 located at the lower end is fixedly communicated with the head of the flue. Then, the raw materials of the molecular sieve are respectively placed in the acid leaching agitator 3 and the high-temperature calciner 4;

[0043] The medium and low-temperature flue gas at the tail of the flue enters the filter barrel 2-2-1 through the air inlet 2-2-2 provided by the ventilation pipe assembly 2-2 located at the upper end. After the dust and impurities in the flue gas are filtered off by the filter screen 2-2-4, it enters the air outlet 2-2-3, and enters the acid leaching agitator 3 through the air outlet 2-2-3 and the first inlet pipe 3-1 for waste heat reuse. The flue gas after utilization enters the air inlet 2-2-2 provided by the ventilation pipe assembly 2-2 located at the upper end again for circulation;

[0044] The high-temperature flue gas at the head of the flue enters the filter barrel 2-2-1 through the air inlet 2-2-2 provided by the ventilation pipe assembly 2-2 located at the lower end. After the dust and impurities in the flue gas are filtered off by the filter screen 2-2-4, it enters the air outlet 2-2-3, and enters the high-temperature calciner 4 through the air outlet 2-2-3 and the second inlet pipe 4-1 for waste heat reuse. After the waste heat of the high-temperature flue gas is utilized, the temperature decreases. The flue gas after the temperature decrease enters the acid leaching agitator 3 through the second outlet pipe 4-2 for reuse again, and flows out through the first outlet pipe 3-2 for circulation after utilization; Through the above method, the cascade utilization of waste heat can be fully carried out, and the reuse after waste heat utilization can also be realized, further strengthening the utilization of waste heat;

[0045] The flue gas entering the intake end 2-2-2 through the first exhaust pipe 3-2 is mixed with the medium- and low-temperature flue gas at the tail of the flue. The medium- and low-temperature flue gas at the tail of the flue can reheat the flue gas flowing out of the first exhaust pipe 3-2. When the temperature sensor 2-3-7 detects that the temperature of the flue gas at the outlet end 2-2-3 is too low (lower than 150°C), it sends a signal to the single-chip microcomputer. The stepping motor 2-3-5 of this device is connected to an external power supply. The single-chip microcomputer sends a signal to the stepping motor 2-3-5, causing the output shaft of the stepping motor 2-3-5 to rotate 90°, thereby driving the flap 2-3-4 to rotate. The rotation of the flap 2-3-4 is misaligned with the baffle hole 2-3-3. At this time, the high-temperature flue gas in the outlet end 2-2-3 of the ventilation pipe assembly 2-2 located at the lower end passes through the baffle hole 2-3-3 and enters above the baffle 2-3-2. After being gathered by the air collector 2-3-6, it enters the outlet end 2-2-3 of the ventilation pipe assembly 2-2 located at the upper end to heat the low-temperature flue gas. When the temperature sensor 2-3-7 detects that the flue gas temperature reaches the standard, it controls the stepping motor 2-3-5 to rotate 90°, causing the flap 2-3-4 to rotate and coincide with the baffle hole 2-3-3. At this time, the high-temperature flue gas no longer circulates. Through the above method, the circulation of high-temperature flue gas and low-temperature flue gas can be realized, thereby avoiding the excessive temperature difference of the flue gas from affecting the waste heat utilization. The setting of the air collector 2-3-6 can increase the flow rate of the high-temperature flue gas passing through, enabling the high-temperature flue gas to flow out quickly, thereby avoiding the reverse flow of the low-temperature flue gas through the air collector 2-3-6. At the same time, an exhaust valve is provided on the first exhaust pipe 3-2. When the exhaust valve is opened, the flue gas in the first exhaust pipe 3-2 is directly discharged without circulating.

[0046] After the filter screen 2-2-4 has been filtering for a long time, dust and impurities will adhere to the upper end. When the flue gas enters the filter barrel 2-2-1 from the intake end 2-2-2, it pushes the air plate 2-2-7 to drive the rotating shaft 2-2-5 to rotate. The rotation of the rotating shaft 2-2-5 then drives the brush plate 2-2-8 to rotate. The rotation of the brush plate 2-2-8 can brush off the dust and impurities adhering to the filter screen 2-2-4, avoiding the adhesion of dust and impurities from affecting the air permeability of the filter screen 2-2-4. At the same time, the setting of the one-way bearing 2-2-6 enables the rotating shaft 2-2-5 to rotate in one direction, which can prevent the rotating shaft 2-2-5 from rotating reciprocally when the flue gas flows, thereby causing the brush plate 2-2-8 to lose its function.

[0047] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent conditions of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0048] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A molecular sieve synthesis system based on cascade utilization of waste heat in a circulating fluidized bed, characterized in that: Comprising: A housing (1), a circulation device (2), an acid leaching stirrer (3) and a high-temperature calciner (4). The circulation device (2) is fixed to the upper end of the housing (1). The acid leaching stirrer (3) and the high-temperature calciner (4) are fixed inside the housing (1). The acid leaching stirrer (3) is communicated with the high-temperature calciner (4). The circulation device (2) is communicated with the acid leaching stirrer (3) and the high-temperature calciner (4).

2. The molecular sieve synthesis system based on cascade utilization of waste heat of circulating fluidized bed according to claim 1, characterized in that: The circulation device (2) comprises: a fixed housing (2-1), a ventilation pipe assembly (2-2) and a temperature regulating unit (2-3). The fixed housing (2-1) is fixed to the upper end of the housing (1). Two of the ventilation pipe assemblies (2-2) are fixed inside the fixed housing (2-1). A temperature regulating unit (2-3) is fixedly communicated between the two ventilation pipe assemblies (2-2).

3. The molecular sieve synthesis system based on cascade utilization of waste heat of circulating fluidized bed according to claim 2, characterized in that: Each of the two ventilation pipe assemblies (2-2) comprises: a filter barrel (2-2-1), an air inlet end (2-2-2), an air outlet end (2-2-3), a filter net (2-2-4), a rotating shaft (2-2-5), a one-way bearing (2-2-6), a wind plate (2-2-7) and a brush plate (2-2-8). The air inlet end (2-2-2) is arranged on one side of the filter barrel (2-2-1). The air outlet end (2-2-3) is arranged on the other side of the filter barrel (2-2-1). The filter net (2-2-4) is arranged on one side of the air outlet end (2-2-3). The two ends of the rotating shaft (2-2-5) are rotatably connected to the inner top surface and the inner bottom surface of the filter barrel (2-2-1) through the one-way bearing (2-2-6). A plurality of the wind plates (2-2-7) and a plurality of the brush plates (2-2-8) are fixed on the rotating shaft (2-2-5). The plurality of the brush plates (2-2-8) and the plurality of the wind plates (2-2-7) are arranged alternately. The plurality of the wind plates (2-2-7) and the plurality of the brush plates (2-2-8) are both in sliding fit with the inner wall of the filter barrel (2-2-1). A dust cleaning port is arranged on the filter barrel (2-2-1).

4. The molecular sieve synthesis system based on cascade utilization of waste heat of circulating fluidized bed according to claim 2, characterized in that: The temperature control unit (2-3) comprises: a connecting pipe (2-3-1), a baffle (2-3-2), a baffle hole (2-3-3), a flap (2-3-4), a stepping motor (2-3-5), an air collecting hood (2-3-6) and a temperature sensor (2-3-7); a connecting pipe (2-3-1) is fixedly connected between the air outlet ends (2-2-3) of the two ventilation pipe assemblies (2-2); a baffle (2-3-2) is horizontally arranged inside the connecting pipe (2-3-1); a baffle hole (2-3-3) is arranged on the baffle (2-3-2); the flap (2-3-4) rotates in the baffle hole (2-3-3); an outer wall of the flap (2-3-4) is in contact with the baffle hole (2-3-3); 3-3) inner wall sliding seal, a stepper motor (2-3-5) is fixed inside the baffle (2-3-2), the output shaft of the stepper motor (2-3-5) is fixedly connected to the rotating shaft at one end of the flap (2-3-4), an air collecting hood (2-3-6) is fixedly connected to the upper end of the connecting pipe (2-3-1), the air collecting hood (2-3-6) is fixedly connected to the air outlet (2-2-3) provided in the ventilation pipe assembly (2-2) at the upper end, a temperature sensor (2-3-7) is provided inside the air outlet (2-2-3) provided in the ventilation pipe assembly (2-2) at the upper end, the lower end of the temperature sensor (2-3-7) is signal-connected to a single-chip microcomputer, and the single-chip microcomputer is signal-connected to the stepper motor (2-3-5).

5. The molecular sieve synthesis system based on cascade utilization of waste heat of circulating fluidized bed according to claim 3, wherein: The acid leaching agitator (3) is provided with an air inlet pipe (3-1) and an air outlet pipe (3-2); the air inlet pipe (3-1) is fixedly connected to an air outlet end (2-2-3) provided at the upper end of the vent pipe assembly (2-2); and the air outlet pipe (3-2) is fixedly connected to an air inlet end (2-2-2) provided at the upper end of the vent pipe assembly (2-2).

6. The molecular sieve synthesis system based on cascade utilization of waste heat of circulating fluidized bed according to claim 5, wherein: The high-temperature calciner (4) is provided with an air inlet pipe (4-1) and an air outlet pipe (4-2). The air inlet pipe (4-1) is fixedly connected to an air outlet end (2-2-3) provided on a vent pipe assembly (2-2) at the lower end, and the air outlet pipe (4-2) is fixedly connected to the acid leaching agitator (3).

7. A method for using the molecular sieve synthesis system based on cascaded utilization of waste heat in a circulating fluidized bed according to claim 6, characterized in that: The method comprises the following steps: S1: The air inlet end (2-2-2) of the vent pipe assembly (2-2) at the upper end is fixedly connected to the tail end of the flue, and the air inlet end (2-2-2) of the vent pipe assembly (2-2) at the lower end is fixedly connected to the head end of the flue; S2: The medium and low temperature flue gas enters the acid leaching agitator (3) through the air inlet pipe (3-1) at the air outlet end (2-2-3) for waste heat reuse, and the flue gas enters the air inlet end (2-2-2) of the ventilation pipe assembly (2-2) at the upper end through the air outlet pipe (3-2) for circulation; S3: The high-temperature flue gas enters the high-temperature calciner (4) through the gas outlet (2-2-3) and the second gas inlet pipe (4-1) to be reused for waste heat, and the flue gas enters the acid leaching agitator (3) through the second gas outlet pipe (4-2) to be reused; S4: When the temperature sensor (2-3-7) detects that the flue gas temperature is too low, it sends a signal to make the output shaft of the stepper motor (2-3-5) rotate 90° so that the high-temperature flue gas heats the low-temperature flue gas; S5: The flue gas pushes the air plate (2-2-7) and the rotating shaft (2-2-5) to rotate, brushing off the dust and impurities adhering to the filter net (2-2-4).

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